Tank Farm Alarm Response Procedure AW Farm USQ # TF-19 ... · REMOVE tape from valve pits I-3 10/09/2018 Operations request and TF Automation / DSA changes Removed/Replaced references

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Respond to Panel ANN-102 Alarms at 271-AW

Type

REFERENCE Document No.

ARP-T-231-00102 Rev/Mod

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Tank Farm Alarm Response Procedure AW Farm

USQ # TF-19-0022-D, Rev. 0

CHANGE HISTORY ( LAST 5 REV-MODS )

Rev-Mod Release Date Justification: Summary of Changes

I-4 01/03/2019 WRPS-PER-2018-2904

Struck out immediate actions [5], [6], part of [8] and [9]

supplemental action [10] possible causes 2

[5] IF directed by the Shift Manager/OE, PERFORM any/all of

the following.

[6] IF alarm clears, PROCEED to Step [11]

[8] CHECK air inlet station opening for obstructions AND

REMOVE. Added ENSURE AW-102 inlet station 12”

isolation valve (AW102-VTP—V-202) is OPEN

[9] OPEN isolated inlet station valves per procedure TO-060-

107.

[10] IF the above steps do not restore tank pressure to proper

range, NOTIFY Shift Manager AND

IF directed, PERFORM the following:

OPEN 3" bypass line valve (AW102-VTP-V-208) on Tank 241-

AW-102.

CLOSE corresponding inlet filter station 12" butterfly valve

(AW102-VTP-V-202) for tank 241-AW-102.

2. OR Both Primary A and B Train exhaust fans were being

operated for a job involving another tank.

Added new immediate action with substeps

1. IF directed by the Shift Manager/OE, PERFORM

any/all of the following:

1. MONITOR tank pressure on TFMCS.

2. ADJUST exhauster stack flow set point per

TO-060-107.

3. REMOVE any ice buildup or obstructions

from AW-102 inlet station.

4. REMOVE tape from valve pits

I-3 10/09/2018 Operations request and

TF Automation / DSA changes

Removed/Replaced references to LCO 3.5. Removed steps that

CHECK magnahelic pressure gauge.

I-2 08/30/2017 PER 17-1176 Updated annulus leak detector information and added additional

information regarding LCO 3.5 into the ARP.

I-1 04/06/2017 Inconsequential Change Impacted Doc. Changed title number from TO-200-040 to

TO-230-040

I-0 05/26/2016 Periodic Review. Updated title of procedure TO-200-040 during periodic review.

241-AW-271 Building Alarm Index

Alarm Description Page

01 ................. Hi Level Leak Detector Pit 02C (WSTA-WFA-132) ................................. .... ........................ 3

02 ................. Hi Pressure Tank 102 (Low Vacuum) (WST-PAH-112) ............................ .... ........................ 5

03 ................. Low Pressure Tank 102 (Hi Vacuum) (WST-PAL-112) ............................ .... ........................ 7

04 ................. Annulus Leak Detected Tank 102 (WSTA-LDA-152) ............................... .... ...................... 10

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09 ................. Hi Rad Alarm Annulus Exh Stack (VTA-RAH-910C) .............................. ...... .................... 12

Figure 1 ........ 241-AW-271 Instrument Building Alarm Panel ANN-102 ........................ ...... .................... 14

RECORDS

No records are generated during the performance of this procedure.

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01 Hi Level Leak Detector Pit 02C (WSTA-WFA-132) .... Facility: 241-AW-271 Building

HI LEVEL

LEAK DETECTOR PIT 02C

(WSTA-WFA-132)

01

Panel: ANN-102 Alarm #: 01

Source: AW02C-WSTA-WFT-132 Setpoint: 37 inches above

pit floor

Alarm Class: Area Status

Alarm Description: Liquid level in the leak detection pit has increased to alarm setpoint.

NOTE - Alarm Response Procedures are not designed for, nor intended to be applied to, "expected"

alarms generated by approved work activities or procedures.

Immediate Actions:

[1] CHECK status of following.

Panel ANN-102 alarm 04, ANNULUS LEAK DETECTED TANK 102

(WSTA-LDA-152).

[2] CHECK pit weight factor indicator, AW271-WSTA-WFI-122, for a level increase.

[3] NOTIFY Shift Manager of findings.

Supplemental Actions:

[4] CHECK annulus Enrafs AW102-WSTA-LDT-151, AW102-WSTA-LDT-152, AW102-

WSTA-LDT-153 level readings.

[5] CHECK associated tank level Enraf (AW102-WST-LIT-106) for any change.

[6] NOTIFY Shift Manager of alarm, actions and findings.

[6.1] IF annulus leak detectors show increased level in the annulus.

[6.1.1] Shift Manager EVALUATE TF-AOP-005 entry criteria.

[6.1.2] Shift Manager NOTIFY maintenance to perform leak detection

verification per 6-LDD-485.

(Continued on Next Page)

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Facility: 241-AW-271 Building

HI LEVEL

LEAK DETECTOR PIT 02C

(WSTA-WFA-132)

01


Source: AW02C-WSTA-WFT-132 Setpoint: 37 inches above

pit floor

(Continued)

Possible Causes:

1. Condensate, rainwater, or snowmelt has accumulated in the pit.

2. A waste leak from the primary tank to the annulus and then from the annulus to the leak

detection pit.

3. A dip tube in the pit is plugged or has a purge air problem.

References:

Drawings: H-14-020502, H-2-70305, H-2-70306, H-2-70394, H-2-70413.

Documents: TO-040-590, Leak Detection Wells, Annulus Leak Detection Systems

OSD-T-151-00007, Operating Specifications for the Double Shell Storage Tanks

OSD-T-151-00007, Operating Specifications for the Double Shell Storage Tanks

RPP-16922, Environmental Specification Requirements

OSD-T-151-00031, Operating Specifications for Tank Farm Leak Detection and

Single Shell Tank Intrusion Detection, Table 3-1

TF-AOP-005, Response to Unexpected Tank Temperature or Flammable Gas

Increase or Level Change

6-LDD-485, ENRAF Series 854 Annulus Leak Detection Gauges Calibration and

Maintenance.

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02 Hi Pressure Tank 102 (Low Vacuum) (WST-PAH-112) .... Facility: 241-AW-271 Building

HI PRESSURE

TANK 102

(LOW VACUUM)

(WST-PAH-112)

02


Source: AW02C-WST-PT-112 Setpoint: - 0.5 inches WG

Alarm Class: Technical Safety Requirement (LCO 3.1, DST Primary Tank Ventilation Systems, and

LCO 3.4, DST Induced Gas Release Event Flammable Gas Control)

Alarm Description: Tank 241-AW-102 vapor space has an increasing pressure (Low Vacuum).



Automatic Actions:

1. Activates Audible Warning Alarm, "AW TANKS HI PRESSURE", to notify farm

occupants of pressurization.

Immediate Actions:

[1] EVACUATE personnel from AW Farm to a protected or upwind area.

[2] REQUEST Shift Manager respond per TF-AOP-021.

[3] CHECK AW Farm tank pressures on TFMCS.

[4] CHECK primary exhaust train is running AND

IF exhauster has shut down, NOTIFY Shift Manager of alarms and actions.

[5] STOP all waste disturbing activities in 241-AW-102.

[6] IF directed by Shift Manager/OE, RESTART Primary ventilation per TO-060-107.

Supplemental Actions:

[7] CONTINUE to monitor system parameters AND

NOTIFY Shift Manager of changing indications.


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HI PRESSURE

TANK 102

(LOW VACUUM)

(WST-PAH-112)

02



(Continued) Possible Causes:

1. Loss of primary ventilation.

2. Hot waste entering tank during transfer raises the pressure through evaporation.

3. Open riser, open pit drain, and/or missing sealing media on pit cover block

cracks/seams/penetrations, admits too much air.

4. Failure of pressure transmitter or pressure alarm switch.

5. Gas release event.

6. Plugged HEPA filters.

7. Failed closed exhaust damper duct valve.

References:

Drawings: H-14-020602.

Documents: OSD-T-151-00007, Operating Specifications for the Double Shell Storage Tanks

TO-230-040, Operate 241-AW-102 Airlift Circulator

TF-AOP-021, Response to Tank Farm Ventilation Upset

TO-060-107, Operate AW Tank Farm Primary Ventilation System (VTP)

HNF-SD-WM-TSR-006, Tank Farms Technical Safety Requirements.

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03 Low Pressure Tank 102 (Hi Vacuum) (WST-PAL-112) .... Facility: 241-AW-271 Building

LOW PRESSURE

TANK 102

(HI VACUUM)

(WST-PAL-112)

03



Alarm Class: Plant Stability

Alarm Description: Low Pressure (High Vacuum) in Tank 241-AW-102.



- Loss of instrument/compressed air will cause the tank pressure charts to fail to the low pressure

(HI VACUUM) position.

Immediate Actions:

[1] CHECK status of compressed air system AND

IF compressed air system was down, RECOMMEND to Shift Manager response per

TF-AOP-002.

[2] CHECK status of the following annunciators:

Panels ANN-101 and ANN-103 through ANN-106 alarm 03, LOW PRESSURE

TANK 10X, (HI VACUUM), (WST-PAL-11X).

[3] CHECK tank pressure strip chart recorder, located on alarm panel just below alarm

windows, AW271-WST-PR-112 (red colored trace), in 271-AW.

[4] CHECK AW Farm tank pressures on TFMCS.

[5] IF directed by the Shift Manager/OE, PERFORM any/all of the following:

[5.1] MONITOR tank pressure on TFMCS.

[5.2] ADJUST exhauster stack flow set point per TO-060-107.

[5.3] REMOVE any ice buildup or obstructions from AW-102 inlet station.

[5.4] REMOVE tape from valve pits.


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LOW PRESSURE

TANK 102

(HI VACUUM)

(WST-PAL-112)

03



(Continued)

Immediate Actions (Cont.):

NOTE - The port controller should float freely. During a high vacuum condition the vacuum

breaker should open.

[6] CHECK port controller (AW102-VTP-FC-202) for binding.

[7] ENSURE AW-102 inlet station 12” isolation valve (AW102-VTP-V-202) is OPEN.

Supplemental Actions

[8] INOTIFY Shift Manager of actions and findings.


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LOW PRESSURE

TANK 102

(HI VACUUM)

(WST-PAL-112)


Source: AW02C-WST-PT-112 Setpoint: - 3.5 inches WG 03

(Continued)

Possible Causes:

1. Obstruction of air inlet (i.e., foreign object across inlet screen, frost/ice buildup on inlet,

filter dirty).

2. Primary exhaust fan remained ON after backup fan started, with or without an open riser.

3. Vacuum or flow rates out of adjustment.

4. Loss of air compressor.

5. Port controller binding.

6. Vacuum breaker is stuck shut.

References:

Drawings: H-14-020102 and H-14-020602.

Documents: OSD-T-151-00007, Operating Specifications for the Double Shell Storage Tanks

TO-060-107, Operate AW Tank Farm Primary Ventilation System (VTP)

TF-AOP-002, Response to Loss of Compressed Air.

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04 Annulus Leak Detected Tank 102 (WSTA-LDA-152) .... Facility: 241-AW-271 Building

ANNULUS LEAK

DETECTED

TANK 102

(WSTA-LDA-152)

04


Source: AW102-WSTA-LDT-151

AW102-WSTA-LDT-152

AW102-WSTA-LDT-153

Setpoint: 0.25 inches above the

annulus bottom

Alarm Class: Environmental

Alarm Description: One or more of the three leak detectors in the tank 241-AW-102 annulus is in

alarm status. This is a common alarm, annunciating when any one of the three

leak detectors in the annulus reaches the setpoint.



Automatic Actions:

None.

Immediate Actions:

[1] ACKNOWLEDGE alarm.

[2] IF a transfer is in progress into or out of 241-AW-102, REQUEST MBD Operator shut

down transfer.

[3] CHECK annulus Enrafs AW102-WSTA-LDT-151, AW102-WSTA-LDT-152, AW102-

WSTA-LDT-153 for the following:

ENRAF local alarms.(HA indication will be in display for an alarm condition)

ENRAF level readings.

[4] CHECK associated tank level Enraf (AW102-WST-LIT-106) for any change.

[5] NOTIFY Shift Manager of alarm, actions and findings.

[5.1] IF annulus leak detectors show increased level in the annulus.

[5.1.1] Shift Manager EVALUATE TF-AOP-005 entry criteria.

[5.1.2] Shift Manager NOTIFY maintenance to perform leak detection

verification per 6-LDD-485.


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ANNULUS LEAK

DETECTED TANK 102

(WSTA-LDA-152)

04


Source: AW102-WSTA-LDT-151

AW102-WSTA-LDT-152

AW102-WSTA-LDT-153

Setpoint: 0.25 inches above the

annulus bottom

(Continued) Supplemental Actions:

[6] Shift Manager NOTIFY Environmental On-Call per TF-REC-001.

Possible Causes:

1. Waste leaking from primary tank to annulus.

2. Condensate, rainwater, snowmelt, or other water has entered the annulus from outside.

3. Time delay relay or control relay fails.

4. Instrument malfunction.

5. ENRAF performed a reset due to loss of power.

References:

Drawings: H-2-70362 Sht.1, H-14-020502.

Documents: RPP-16922, Environmental Specification Requirements

OSD-T-151-00031, Operating Specifications for Tank Farm Leak Detection and Single

Shell Tank Intrusion Detection, Table 3-1

TF-AOP-005, Response to Unexpected Tank Temperature or Flammable Gas Increase or

Level Change

6-LDD-485, ENRAF Series 854 Annulus Leak Detection Gauges Calibration and

Maintenance.

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09 Hi Rad Alarm Annulus Exh Stack (VTA-RAH-910C) ...... Facility: 241-AW-271 Building

HI RAD ALARM

ANNULUS EXH

STACK

(VTA-RAH-910C)

09


Source: AW296-VTA-CAM-910 Setpoint: Nominally 3000 CPM

Alarm Class: Environmental Impact

Alarm Description: High Radiation Alarm Annulus Exhaust Stack.



Immediate Actions:

[1] EVACUATE all personnel from AW Farm.

[2] ENSURE annulus exhauster is shut down.

[3] STOP all waste disturbing activities in AW-Farm.

[4] NOTIFY Shift Manager AND

REQUEST Health Physics Technician assistance.

[5] CHECK status of the following annunciators:

Panel ANN-101 through ANN-106 alarm 04, ANNULUS LEAK DETECTED

TANK 10X, (WSTA-LDA-15X).

[6] IF entering Farm, DON Self Contained Breathing Apparatus and personal protective

equipment until alarm is clear and farm is released by Health Physics Technician.

[7] REQUEST Health Physics Technician perform radiological survey of AW Tank Farm.


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HI RAD ALARM

ANNULUS EXH

STACK

(VTA-RAH-910C)

09


Source: AW296-VTA-CAM-910 Setpoint: Nominally 3000 CPM

(Continued) Supplemental Actions:

[8] REQUEST Shift Manager evaluate need to notify Environmental.

[9] REQUEST Health Physics Technician perform survey of continuous air monitor sampler

filter paper and record sampler filter paper reading.

[10] IF alarm on CAM is in alarm and filter paper readings are less than 3000 cpm,

PERFORM the following:

[10.1] REQUEST Health Physics Technician to reset the alarm.

[10.2] RESTART annulus exhaust system per TO-060-105.

[10.3] REQUEST HPT to perform TF-OPS-005.

[11] IF filter paper readings are greater than 3000 cpm, PERFORM the following:

[11.1] NOTIFY Shift Manager of findings.

[11.2] ENSURE annulus exhaust system remains shut down.

[11.3] TAKE ACTIONS, as directed by the Shift Manager to

LOCK OUT/TAG OUT annulus exhaust system.

[11.4] CONTACT Tank Farms Engineering.

Possible Causes:

1. Waste has leaked from one of the AW Tanks to its annulus.

2. Setpoint is too low and background radiation spikes set it off.

3. The annulus stack continuous air monitor has failed.

References:

Drawings: H-2-92520 and H-14-020202.

Documents: TO-060-105, Operate 241-AW Annulus Ventilation System (VTA)

TF-OPS-005, DST Daily CAM and Record Sampler Inspections.

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Figure 1 241-AW-271 Instrument Building Alarm Panel ANN-102 ......

Figure 1 - 241-AW-271 Instrument Building Alarm Panel ANN-102

HI LEVEL

LEAK DETECTOR PIT

02C

(WSTA-WFA-132)

HI PRESSURE

TANK 102

(LOW VACUUM)

(WST-PAH-112)

LOW PRESSURE

TANK 102

(HI VACUUM)

(WST-PAL-112)

ANNULUS LEAK

DETECTED

TANK 102

(WSTA-LDA-152)

01 02 03 04 05

HI RAD ALARM

ANNULUS EXH

STACK

(VTA-RAH-910C)

06 07 08 09 10